This looks like a really cool concept.
What is the chance of destroying a permanent?
How is the destroyed permanent chosen? (randomly, first played)
Do permanents in stacks have a greater chance of being destroyed?
Is the entire stack destroyed, or only one at a time?
Can shields and weapons be destroyed?
How does this work with Protect Artifact?
Also, your art link just brings you straight to the image URL, not the source. Did you make it yourself? If you didn't, I think you need the source in there.